I have a luxaire furnance that intermittantly will not start up ,I have to reset it by cycling the door switch, than it works for awhile. At the begining of the heating season it works fine.After 2 months(approx) it stops working again. I had 2 different T-stats installed 3different hot surface ignition controls installed, 1 limit control installed and some type of coil installed by a heating Co. This is the 3rd year in a row we've had this problem, I really don't want to install a new furnance. The unit was installed in 1991 if that helps any, and it has a glow plug to ignite it . Thanks Tim65